In one of our sites, we removed the "SnowballPorterFilterFactory" filter from the "text" field type for the "index" and "query" analyzers. I don't want to lead you down the wrong path if it is not a stemming problem, though -- you should use the Query Analyzer at yoursite.com:8983/solr/admin/analysis.jsp?highlight=on to find out more about why queries aren't matching.